东昆仑地区地球物理特征与矿产资源分布

利用东昆仑地区的区域重磁场及深部地球物理信息，研究探讨了地球物理特征与矿产资源的关系。贯穿研究区的重力梯级带反映了地壳深部构造的深大断裂带，该梯级带与昆中断裂对应，它不仅是划分构造单元的边界，而且与地壳构造运动的性质及岩浆活动、矿产分布等密切相关。研究区航磁异常区以东西向、北西向和北东向为主，异常呈交叉及串珠状分布。沿重力梯级带及航磁异常周围形成一些具工业价值的矿床。深部地质与地球物理资料揭示了该区地壳与上地幔密度分布的不均匀性及其速度结构差异。深大断裂的发育对该地区金属成矿区带的分布起到了控制作用。

Geophysical features and distribution of ore resources in east Kunlun area

East Kunlun area is one of the key geological units in northern Tibetan plateau, and also an important base area of mineral resources. The authors deal with the relationship between geophysical features and mineral resources in the study area by analyzing regional gravity and magnetic field combined with a study of geophysical data in depth. The study reveals the domination of WE-, NW- and NE-trending gravity and magnetic anomalies in this area, which reflects not only the distribution pattern of abyssal faults but also the close tie between the anomalies and the properties of crustal tectonics, magnetism and mineral resources. The deep geophysical data imply the heterogeneity in crustal and mantle density, and difference in velocity structures. It is also suggested that, with the rich abyssal faults, the crustal-mantle materials are provided with an upward moving gateway. The abyssal faults play an important role in controlling the metallogenic zoning in the area. The volcanism and magmatism provide a good environment for metallization in the area.